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/* Copyright (c) Mark J. Kilgard, 1996. */
/* This program is freely distributable without licensing fees
and is provided without guarantee or warrantee expressed or
implied. This program is -not- in the public domain. */
#include <stdlib.h>
#include <string.h>
#include "glutint.h"
int __glutMesaSwapHackSupport = 0; /* Not supported until
proven otherwise. */
/* Use the "Mesa swap hack" if reasonable if and only if
MESA_SWAP_HACK is set to something whose first character is
not "N" or "n" AND "Brian Paul" is the vendor string AND
"Mesa X11"* (or "Mesa" for backward compatibility) is the
renderer string.
Anyone who modifies Mesa so that glXSwapBuffers does not
simply blit the previously rendered back buffer should
change either their vendor or renderer string to avoid
confusing GLUT. */
void
__glutDetermineMesaSwapHackSupport(void)
{
static int doneAlready = 0;
char *env, *vendor, *renderer;
if (doneAlready)
return;
env = getenv("MESA_SWAP_HACK");
if (env) {
if ((env[0] != 'n') && (env[0] != 'N')) {
vendor = (char *) glGetString(GL_VENDOR);
renderer = (char *) glGetString(GL_RENDERER);
/* Old versions of X11 Mesa uses the renderer string
"Mesa"; Brian plans to start using "Mesa X11" to
distinguish the X version of Mesa from other flavor
such as Windows or 3Dfx. */
#define MESA_X11 "Mesa X11"
/* XXX At some point in the future, eliminate the
backward compatibility for the old "Mesa" renderer
string. */
if (!strcmp(vendor, "Brian Paul") && (!strcmp(renderer, "Mesa") ||
!strncmp(renderer, MESA_X11, sizeof(MESA_X11) - 1)))
__glutMesaSwapHackSupport = 1;
}
}
doneAlready = 1;
}
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